Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Myosin are motor proteins that drive forces and movement on actin filaments.
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- Embryonic myoblasts fuse to form single muscle fibers during development; thus skeletal muscle cells are multinucleated. True or False True Falsearrow_forwardThick and thin myofilaments have different properties. For each phrase below, indicate whether the filament described is thick or thin (write thick or thin in the blanks).__(1) contains myosin heads__(2) contains actin__(3) does not lie in the H zone__(4) contains myosin__(5) attaches to a Z disc__(6) does not lie in the I bandarrow_forwardTropomyosin covers the active sites on actin until it is ready for myosin to bond for a muscle contraction. True Falsearrow_forward
- Tropmyosin and Troponin are called the regulatory proteins in muscle contraction. Describe the myofibril organization and specific structural and functional role of these two proteins in muscle contraction-relaxation cycle.arrow_forwardWhich of the following shortens in length during skeletal mucle contraction? select all that apply Action filaments H- zone A- band I- bandarrow_forwardContractile muscle cells cannot be created in culture. True Falsearrow_forward
- What prevents the filaments from sliding back to their original position each time a myosin cross bridge detaches from actin?arrow_forwardSkeletal muscle cells have the ability to do all of the following EXCEPT _____. activating other muscle cells to contract producing force while shortening responding to chemicals released by nerve cells rebounding to their former length after being stretchedarrow_forwardWhat step DIRECTLY causes a sarcomere to shorten? cross- bridge formation calcium transport into SR calcium release power stroke myosin heads in high energy statearrow_forward
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